Your search found 2 records
1 Wei, J.; Cui, Y.; Zhou, S.; Luo, Y. 2022. Regional water-saving potential calculation method for paddy rice based on remote sensing. Agricultural Water Management, 267:107610. (Online first) [doi: https://doi.org/10.1016/j.agwat.2022.107610]
Water conservation ; Rice ; Remote sensing ; Irrigation water ; Flood irrigation ; Water balance ; Energy balance ; Evapotranspiration ; Surface temperature ; Mapping ; Drainage ; Datasets ; Models / China / Hubei / Zhanghe Irrigation District
(Location: IWMI HQ Call no: e-copy only Record No: H051065)
(6.00 MB)
To improve the calculation applicability and operability of regional water-saving potential (RWSP) for paddy rice, a calculation method based on remote sensing (RWSP-RS) was proposed. RWSP-RS consists of three sections: (a) paddy rice mapping by the decision tree algorithm, (b) rice evapotranspiration (ET) inversion under different irrigation modes by the surface energy balance algorithm for land (SEBAL), and (c) WSP based on ET (WSPE) and irrigation (WSPI) calculation by coupling water balance models for paddy fields. The RWSP-RS was applied in the Zhanghe Irrigation District in southern China in 2018 and 2019. The results showed that the three sections of RWSP-RS had high precision: paddy rice mapping errors ranged from 2% to 16%; WSPE of paddy rice errors were 26 mm and 5 mm for 2018 and 2019, respectively; and WSPI errors were 5 mm and 23 mm for 2018 and 2019, respectively. The WSPI of paddy rice in the whole region was 44.52 million m3 and 99.12 million m3 for 2018 and 2019, respectively. RWSP-RS has the characteristics of solid operability, good regional applicability, and time and labor savings, making it a recommended method for calculating the RWSP of paddy rice and contributing to regional water resource management.
2 Gong, B.; Liu, Z.; Liu, Y.; Zhou, S.. 2023. Understanding advances and challenges of urban water security and sustainability in China based on water footprint dynamics. Ecological Indicators, 150:110233. (Online first) [doi: https://doi.org/10.1016/j.ecolind.2023.110233]
Water security ; Sustainability ; Water footprint ; Water deficit ; Landscape ; Water pollution ; Towns ; Policies ; Water resources ; Water use ; Surface water ; Precipitation ; Sewage treatment / China
(Location: IWMI HQ Call no: e-copy only Record No: H051851)
https://www.sciencedirect.com/science/article/pii/S1470160X23003758/pdfft?md5=ba7a578381a185737d690626b44fcbee&pid=1-s2.0-S1470160X23003758-main.pdf
https://vlibrary.iwmi.org/pdf/H051851.pdf
https://vlibrary.iwmi.org/pdf/H051851.pdf
(16.90 MB) (16.9 MB)
Sustainability of China’s numerous cities are threatened by both quantity- and quality-induced water scarcity, which can be measured by the water footprint from a consumption (WFcons) or production (WFprod) perspective. Although WFcons was widely assessed, the changes in WFprod of China’s cities were still unclear. A large-scale decrease in urban WFprod in China was found, with the average WFprod decreasing from 13.8 billion m3 to 10.3 billion m3 and the per capita WFprod decreasing from 1614.8 m3/person to 1184.0 m3/person (i.e., falling by more than a quarter in just six years). Such shrinkage was particularly evident in drylands, eliminating the water deficit in Xi’an and Xining. The reduction in grey WFprod caused by implementing water pollution prevention policies and other relevant measures played the most important role in the savings. In the future, the implementation of updated pollution discharge standards is projected to allow more cities to escape water deficits; however, the rapid growth of the domestic and ecological blue WFprod caused by urbanization and urban greening would destabilize this prospect. Thus, attention should be given to both water pollution prevention and domestic and ecological blue WFprod restriction to further alleviate urban water scarcity in China.
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